Ok so I've got to the bit in Season 3 where (SPOILER) Ward jumps up the evil ladder another notch and turns on the InHuman inducing gas into Gardener's cell. I would like to know which episode Lash was introduced as I have missed some ones previous to this. Did Gardner and Agent May get back together briefly as well?

Little help from anyone who has watched season 3 up to this point?

At least I think its Season 3, all these mid season breaks throw me off.